Re: Save mail in multiple mbox files

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>> Having dealt with a topic, you really need something like rmail (or
>> mailx or whatever) to clean up. B <del> is not going to work here.
>
> I don't remember being able to edit mboxes with rmail.  I commonly use
> mailx for this.

Sure you can use rmail. There is no need to start a shell and mailx.
C-u rmail, point it to the file and you can do all the things you would
expect (d for delete, e for literally editing the message, add labels,
...)